1
|
Le HM, d'Hemecourt PA, Jackson SS, Whitney KE, Miller PE, Millis MB, Wuerz TH, Kiapour AM, Lewis CL, Stracciolini A. Protocol and validity testing of femoroacetabular posterior translation with dynamic hip ultrasonography. Skeletal Radiol 2024; 53:1287-1293. [PMID: 38217703 DOI: 10.1007/s00256-024-04560-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 12/30/2023] [Accepted: 01/01/2024] [Indexed: 01/15/2024]
Abstract
OBJECTIVE To describe femoroacetabular posterior translation (FAPT) using dynamic hip ultrasonography (DHUS), and to determine the inter- and intra-rater reliability of hip ultrasound measurements of FAPT. MATERIALS AND METHODS The study design was a feasibility study of 13 healthy young adults (26 hips) using test-retest analysis. The data was collected prospectively over a 2-week time period. Three DHUS measurements (posterior neutral (PN), flexion, adduction, and internal rotation (PFADIR), and stand and load (PStand) were measured by four independent raters (2 senior who divided the cohort, 1 intermediate, 1 junior) at two time points for bilateral hips of each participant. Reliability was assessed by calculating the intraclass correlation coefficient (ICC) along with 95% confidence intervals (CIs) for each rater and across all raters. RESULTS A total of 468 US scans were completed. The mean age of the cohort was 25.7 years (SD 5.1 years) and 54% were female. The inter-rater reliability was excellent for PFADIR (ICC 0.85 95% CI 0.76-0.91), good for PN (ICC 0.69 95% CI 0.5-0.81), and good for PStand (ICC 0.72 95% CI 0.55-0.83). The intra-rater reliability for all raters was good for PFADIR (ICC 0.60 95% CI 0.44-0.73), fair for PN (ICC 0.42 95% CI 0.21-0.59), and fair for PStand (ICC 0.42 95% CI 0.22-0.59). CONCLUSION This is the first study to present a protocol using dynamic ultrasonography to measure FAPT. DHUS measure for FAPT was shown to be reliable across raters with varying levels of ultrasound experience.
Collapse
Affiliation(s)
- Hung M Le
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA.
- Health Services, Brown University, Providence, RI, USA.
| | - Pierre A d'Hemecourt
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA
- Harvard Medical School, Boston, MA, USA
| | - Sarah S Jackson
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA
- Harvard Medical School, Boston, MA, USA
| | - Kristin E Whitney
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA
- Harvard Medical School, Boston, MA, USA
| | - Patricia E Miller
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA
| | - Michael B Millis
- Harvard Medical School, Boston, MA, USA
- Department of Orthopedics, Boston Children's Hospital, Boston, MA, USA
| | - Thomas H Wuerz
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA
- Center for Hip Preservation, Division of Sports Medicine, New England Baptist Hospital, Boston, MA, USA
| | - Ata M Kiapour
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA
- Harvard Medical School, Boston, MA, USA
| | - Cara L Lewis
- Department of Physical Therapy and Athletic Training, Boston University, Boston, MA, USA
| | - Andrea Stracciolini
- Department of Orthopedics, Division of Sports Medicine, Boston Children's Hospital, 319 Longwood Ave, Boston, MA, 02115, USA
- Harvard Medical School, Boston, MA, USA
| |
Collapse
|
2
|
Honda T, Downey B, Kerkhof D, Le HM, McNaughton M, Corrado G. Considering the Impact of Preparticipation Screening Guidelines on Health Equity for Collegiate Athletes. Eur J Prev Cardiol 2024:zwae135. [PMID: 38593197 DOI: 10.1093/eurjpc/zwae135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 04/02/2024] [Accepted: 04/06/2024] [Indexed: 04/11/2024]
Affiliation(s)
- Trenton Honda
- School of Clinical and Rehabilitation Sciences, Northeastern University, Boston, MA
| | - Brian Downey
- Division of Cardiology, Department of Medicine, Tufts Medical Center, Boston, MA
- Assistant Professor of Medicine, Tufts University School of Medicine, Boston, MA
| | - Deanna Kerkhof
- School of Clinical and Rehabilitation Sciences, Northeastern University, Boston, MA
| | - Hung M Le
- Boston Children's Hospital, Division of Sports Medicine, Boston, MA
- Brown University, Health Services, Providence, RI
| | - Michael McNaughton
- University of New England College of Medicine, Biddeford, MA
- University of Massachusetts Athletics, Amherst, MA
| | - Gianmichel Corrado
- School of Clinical and Rehabilitation Sciences, Northeastern University, Boston, MA
- Harvard Medical School, Boston, MA
| |
Collapse
|
3
|
Nguyen TB, Nguyen TTH, Huynh SQ, Phu TV, Taha AM, Nguyen D, Le HM, Nguyen HN, Nguyen LTK, Tran NT. Seroprevalence of Toxocara at Tra Vinh University Hospital in Vietnam. Eur Rev Med Pharmacol Sci 2023; 27:10334-10341. [PMID: 37975357 DOI: 10.26355/eurrev_202311_34308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
OBJECTIVE The study aims to assess the seroprevalence of Toxocariasis and its associated risk factors among individuals attending the outpatient department at Tra Vinh University Hospital, Vietnam, in 2022. SUBJECTS AND METHODS A cross-sectional survey was conducted among outpatients of Tra Vinh University Hospital. Toxocariasis diagnosis was based on the Enzyme-Linked Immunosorbent Assay (ELISA) performed at the hospital's laboratory department. We assessed the seroprevalence of Toxocariasis and evaluated associated risk factors, including demographics and certain behaviors. RESULTS Of the 249 participants surveyed, 165 tested positive for Toxocariasis, yielding a seroprevalence of 66.3% (95% CI: 60.4-72.1). Multivariate analysis revealed that age groups up to 30 and 30-60 years had higher odds of Toxocariasis infection, with adjusted odds ratios (aOR) of 2.52 (95% CI: 1.04-6.11) and 3.21 (95% CI: 1.44-7.15) respectively. Additionally, individuals residing in rural areas and those in contact with dogs or cats had increased risks, with aORs of 2.21 (95% CI: 1.21-4.01) and 2.04 (95% CI: 1.10-3.79), respectively. Notably, hand washing before eating emerged as a protective factor against Toxocariasis, presenting an aOR of 0.38 (95% CI: 0.19-0.76). CONCLUSIONS Our findings underscore a significant seroprevalence (66.3%) of Toxocara spp. among outpatients at Tra Vinh University Hospital. Proactive measures, including hand hygiene before meals and after pet interactions, are advocated. There is a pronounced need for community-level epidemiological surveillance for human Toxocariasis.
Collapse
Affiliation(s)
- T B Nguyen
- Faculty of Medicine and Pharmacy, Tra Vinh University, Tra Vinh, Vietnam.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Tran NT, Phan TNT, Pham TT, Le TT, Le HM, Nguyen DT, Lam AN, Pham TT, Le HT, Dang NB, Tran KC, Tran VD. Urban-rural disparities in acceptance of human papillomavirus vaccination among women in Can Tho, Vietnam. Ann Ig 2023; 35:641-659. [PMID: 37313797 DOI: 10.7416/ai.2023.2575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Background In Vietnam, cervical cancer is a significant public health concern for women. Unfortunately, despite the availability of the HPV vaccine, low vaccination rates persist. Objectives This study investigates the discrepancy between urban and rural areas in the willingness to receive HPV vaccination with or without fees. Methods A cross-sectional study was conducted on a sample of 648 women aged between 15 and 49, living in two urban and two rural Vietnamese districts of Can Tho, between May and December 2021. Results The overall vaccination rate was 4%, with urban women having a higher rate of 4.9% compared to rural women at 3.1%. Among unvaccinated women, those from rural areas expressed a significantly higher desire to receive the free vaccine (91.4%) than urban women (84.4%). However, the intention to vaccinate declined when rural women and urban women were advised to pay the cost (63.4% and 57.1%, respectively). A strong correlation was found between a positive attitude and intention for vaccination, irrespective of its price or free availability. Education and access to information about the HPV vaccine were also identified as the most significant factors influencing the intention to vaccination among urban and rural women. Conclusion The low HPV vaccination rates among women aged 15-49 living in both urban and rural regions of Vietnam are a notable public health concern. These outcomes emphasize the critical need for effective programs of vaccine laterization, as an introduction to the offer of affordable and accessible HPV vaccines for women in Can Tho, Vietnam.
Collapse
Affiliation(s)
- N T Tran
- Department of Environment and Occupational Health, Faculty of Public Health, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - T N T Phan
- Department of Environment and Occupational Health, Faculty of Public Health, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - T T Pham
- Department of Nutrition and Food Safety, Faculty of Public Health, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - T T Le
- Department of Environment and Occupational Health, Faculty of Public Health, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - H M Le
- Department of Epidemiology, Faculty of Public Health, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - D T Nguyen
- Department of Biostatistics and Demography, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - A N Lam
- Department of Epidemiology, Faculty of Public Health, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - T T Pham
- Department of Health Organization and Management, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - H T Le
- Department of Health Organization and Management, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - N B Dang
- Pharmaceutical Biotechnology, Faculty of Pharmacy, Dong Thap Medical College, Dong Thap, Vietnam
| | - K C Tran
- Science in Pharmacy, Faculty of Pharmacy, Dong Thap Medical College, Dong Thap, Vietnam
| | - V D Tran
- Department of Health Organization and Management, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| |
Collapse
|
5
|
Ma N, Ohtani R, Le HM, Sørensen SS, Ishikawa R, Kawata S, Bureekaew S, Kosasang S, Kawazoe Y, Ohara K, Smedskjaer MM, Horike S. Exploration of glassy state in Prussian blue analogues. Nat Commun 2022; 13:4023. [PMID: 35821027 PMCID: PMC9276687 DOI: 10.1038/s41467-022-31658-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 06/27/2022] [Indexed: 11/10/2022] Open
Abstract
Prussian blue analogues (PBAs) are archetypes of microporous coordination polymers/metal–organic frameworks whose versatile composition allows for diverse functionalities. However, developments in PBAs have centred solely on their crystalline state, and the glassy state of PBAs has not been explored. Here we describe the preparation of the glassy state of PBAs via a mechanically induced crystal-to-glass transformation and explore their properties. The preservation of short-range metal–ligand–metal connectivity is confirmed, enabling the framework-based functionality and semiconductivity in the glass. The transformation also generates unconventional CN− vacancies, followed by the reduction of metal sites. This leads to significant porosity enhancement in recrystallised PBA, enabled by further accessibility of isolated micropores. Finally, mechanical stability under stress for successful vitrification is correlated to defect contents and interstitial water. Our results demonstrate how mechanochemistry provides opportunities to explore glassy states of molecular framework materials in which the stable liquid state is absent. Developments in Prussian blue analogues (PBAs) have centred solely on their crystalline state. Here, the authors describe the preparation of the glassy state of PBAs via a mechanically induced crystal-to-glass transformation and explore their properties.
Collapse
Affiliation(s)
- Nattapol Ma
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Ryo Ohtani
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Hung M Le
- Materials & Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam
| | - Søren S Sørensen
- Department of Chemistry and Bioscience, Aalborg University, Aalborg, 9220, Denmark
| | - Ryuta Ishikawa
- Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Satoshi Kawata
- Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Sareeya Bureekaew
- Department of Chemical and Biomolecular Engineering, School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| | - Soracha Kosasang
- Department of Chemical and Biomolecular Engineering, School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan
| | - Koji Ohara
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo, 679-5198, Japan
| | - Morten M Smedskjaer
- Department of Chemistry and Bioscience, Aalborg University, Aalborg, 9220, Denmark
| | - Satoshi Horike
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan. .,AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Yoshida-Honmachi, Sakyo-ku, Kyoto, 606-8501, Japan. .,Institute for Integrated Cell-Material Sciences, Institute for Advanced Study, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto, 606-8501, Japan. .,Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand.
| |
Collapse
|
6
|
Hallali G, Le HM, Souied E, Doan S. [Severe eyelid eczema secondary to intravenous obnituzumab treated successfully with tacrolimus cream: Case report]. J Fr Ophtalmol 2022; 45:e426-e427. [PMID: 35659427 DOI: 10.1016/j.jfo.2022.01.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 01/21/2022] [Accepted: 01/26/2022] [Indexed: 11/27/2022]
Affiliation(s)
- G Hallali
- Service d'ophtalmologie, hôpital intercommunal Henri-Mondor, université Paris-Est Créteil (UPEC, Paris XII), 40, avenue de Verdun, 94000 Créteil, France; Service d'ophtalmologie, fondation Adolphe de Rothschild, 29, rue Manin, 75019 Paris, France.
| | - H M Le
- Service d'ophtalmologie, hôpital intercommunal Henri-Mondor, université Paris-Est Créteil (UPEC, Paris XII), 40, avenue de Verdun, 94000 Créteil, France
| | - E Souied
- Service d'ophtalmologie, hôpital intercommunal Henri-Mondor, université Paris-Est Créteil (UPEC, Paris XII), 40, avenue de Verdun, 94000 Créteil, France
| | - S Doan
- Service d'ophtalmologie, fondation Adolphe de Rothschild, 29, rue Manin, 75019 Paris, France
| |
Collapse
|
7
|
Abstract
OBJECTIVE Hallux sesamoid injuries are well described and can be debilitating and chronically disabling. The role of orthobiologics such as platelet-rich plasma (PRP) in sesamoid injuries has not been reported. This study describes three cases of recalcitrant hallux sesamoid injuries in teenage athletes who returned to impact activities, pain free, following one treatment of PRP. METHODS This is a case-series study describing three teenage athletes presenting to a tertiary level pediatric sports medicine practice with chronic hallux sesamoid injuries. RESULTS The three patients (two female, one male) described in this case series were 13-, 16-, and 17-year-old athletes. Their primary sports were ballet, basketball, and Irish step dance, respectively. All three athletes received PRP: two received unilateral treatment (one tibial sesamoid, one fibular sesamoid) and one received treatment to bilateral tibial sesamoids. The average duration of symptoms prior to PRP was 52.5 weeks (14-128 weeks). The average time out of their primary sport was 48.7 weeks (20-78 weeks). Three of the 4 sesamoids treated with PRP were tibial sesamoids. Each site of injury was treated with one treatment of leukocyte-rich PRP. All three athletes were cleared to return to impact activities such as running and jumping at 6-9 weeks following PRP, specifically 9 weeks after the final PRP injection for the patient who underwent bilateral treatments. CONCLUSION In the three cases provided of sesamoid injuries treated with PRP, the time to return to impact activities was less than reported for athletes not treated with PRP. Acknowledging that other management factors likely contributed to return to impact activities, this case series sets the groundwork for future research investigating the role of PRP with needle fenestration in the treatment of sesamoid injuries.
Collapse
Affiliation(s)
- Hung M Le
- Division of Sports Medicine, Orthopedics Department, Boston Children's Hospital, Boston, MA, USA
| | - Andrea Stracciolini
- Division of Sports Medicine, Orthopedics Department, Boston Children's Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Cynthia J Stein
- Division of Sports Medicine, Orthopedics Department, Boston Children's Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Bridget J Quinn
- Division of Sports Medicine, Orthopedics Department, Boston Children's Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Sarah S Jackson
- Division of Sports Medicine, Orthopedics Department, Boston Children's Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| |
Collapse
|
8
|
Le HM, Kumar S, May N, Martinez-Baez E, Sundararaman R, Krishnamoorthy B, Clark AE. Behavior of Linear and Nonlinear Dimensionality Reduction for Collective Variable Identification of Small Molecule Solution-Phase Reactions. J Chem Theory Comput 2022; 18:1286-1296. [PMID: 35225611 DOI: 10.1021/acs.jctc.1c00983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Identifying collective variables (CVs) for chemical reactions is essential to reduce the 3N-dimensional energy landscape into lower dimensional basins and barriers of interest. However, in condensed phase processes, the nonmeaningful motions of bulk solvent often overpower the ability of dimensionality reduction methods to identify correlated motions that underpin collective variables. Yet solvent can play important indirect or direct roles in reactivity, and much can be lost through treatments that remove or dampen solvent motion. This has been amply demonstrated within principal component analysis (PCA), although less is known about the behavior of nonlinear dimensionality reduction methods, e.g., uniform manifold approximation and projection (UMAP), that have become recently utilized. The latter presents an interesting alternative to linear methods though often at the expense of interpretability. This work presents distance-attenuated projection methods of atomic coordinates that facilitate the application of both PCA and UMAP to identify collective variables in the presence of explicit solvent and further the specific identity of solvent molecules that participate in chemical reactions. The performance of both methods is examined in detail for two reactions where the explicit solvent plays very different roles within the collective variables. When applied to raw molecular dynamics data in solution, both PCA and UMAP representations are dominated by bulk solvent motions. On the other hand, when applied to data preprocessed by our attenuated projection methods, both PCA and UMAP identify the appropriate collective variables (though varying sensitivity is observed due to the presence of explicit solvent that results from the projection method). Importantly, this approach allows identification of specific solvent molecules that are relevant to the CVs and their importance.
Collapse
Affiliation(s)
- Hung M Le
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Sushant Kumar
- Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Nathan May
- Department of Mathematics and Statistics, Washington State University, Vancouver, Washington 98686, United States
| | - Ernesto Martinez-Baez
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Ravishankar Sundararaman
- Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Bala Krishnamoorthy
- Department of Mathematics and Statistics, Washington State University, Vancouver, Washington 98686, United States
| | - Aurora E Clark
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| |
Collapse
|
9
|
Le HM, Stracciolini A. Current Recommendations on Returning to Youth Sports After COVID-19 Infection. Pediatr Ann 2021; 50:e461-e464. [PMID: 34757873 DOI: 10.3928/19382359-20211018-02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Children represent a small fraction of total cumulative cases of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. The potential health consequences related to infection for children are not inconsequential. For example, some may develop multisystem inflammatory syndrome in children, which is commonly associated with cardiovascular involvement. Nevertheless, the short- and long-term effects of SARS-CoV-2 infection remain unknown. In particular, the impact on physical health and how it affects one's ability to return to physical activity are continuously evolving. As more youth sports organizations are lifting restrictions, the volume of youth athletes will increase and the demand for providing medical clearance will grow. This article aims to provide a review of return to physical activity guidelines for young athletes post-SARS-CoV-2 infection based on expert consensus statements and professional organization recommendations. [Pediatr Ann. 2021;50(11):e461-e464.].
Collapse
|
10
|
Abstract
ABSTRACT The spontaneous regression of an osteochondroma is extremely rare. We report a case of medial femoral condyle impaction fracture over the site of spontaneous regression of a pedunculated osteochondroma discovered on advanced imaging after an acute injury in a 16-year-old male American football athlete. Although spontaneous regression of an osteochondroma has been described, the case presented reveals questions regarding resultant architectural changes to the bone after resorption, leaving it prone to injury. This is the first case that describes increased injury risk potential at the site of osteochondral regression.
Collapse
Affiliation(s)
- Hung M Le
- Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, MA
| | | | | |
Collapse
|
11
|
Le HM, Downey BC, Lanois CJ, Miller PE, Stein CJ, Kerkhof DL, Corrado GD. Comparison of the Limb-lead Electrocardiogram to the 12-Lead Electrocardiogram for Identifying Conditions Associated with Sudden Cardiac Death in Youth Athletes. Am J Cardiol 2021; 152:146-149. [PMID: 34237610 DOI: 10.1016/j.amjcard.2021.04.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 04/15/2021] [Accepted: 04/19/2021] [Indexed: 11/19/2022]
Abstract
The optimal screening strategy to prevent sudden cardiac death (SCD) in athletes remains unknown. Pre-participation screening with electrocardiogram (ECG) remains controversial. The utility and accuracy of limb-lead (LL) ECG alone in identifying cardiac abnormalities associated with SCD has not been studied. This study was a comparative secondary data analysis, comparing the interpretation accuracy of 4 physicians evaluating publicly available ECGs of the most common cardiac conditions associated with SCD in athletes. Each physician interpreted a total of 100 ECGs: 50 normal ECGs (25 LL and 25 standard 12L) and 50 abnormal ECGs (25 LL and 25 standard 12L). The agreement between LL ECGs and 12L ECGs was assessed by Cohen's kappa coefficient and the accuracy of identifying an abnormal ECG was compared across LL and 12L ECGs using a chi-squared test. Inter-rater reliability was assessed by estimating the Fleiss's kappa coefficient. The sensitivity of LL ECG and 12L ECG was identical at 86%. The specificity of LL ECG was 75% (95% CI = 65% to 83%) and 12L ECG was 82% (95% CI = 73% to 89%). Substantial agreement was seen between LL ECG and 12L ECG interpretation across all readers (k = 0.63; 95% CI = 0.49 to 0.77). Interpretation accuracy was 81% (95% CI = 74% to 86%) and 84% (95% CI 78% to 89%) using LL ECG and 12L ECG, respectively (p = 0.43). In conclusion, the accuracy, sensitivity, and specificity were high and comparable for both LL ECG and 12L ECG in identifying cardiovascular conditions associated with SCD. Agreement between LL ECG and 12L ECG was substantial.
Collapse
MESH Headings
- Arrhythmogenic Right Ventricular Dysplasia/complications
- Arrhythmogenic Right Ventricular Dysplasia/diagnosis
- Arrhythmogenic Right Ventricular Dysplasia/physiopathology
- Athletes
- Brugada Syndrome/complications
- Brugada Syndrome/diagnosis
- Brugada Syndrome/physiopathology
- Cardiomyopathy, Dilated/complications
- Cardiomyopathy, Dilated/diagnosis
- Cardiomyopathy, Dilated/physiopathology
- Cardiomyopathy, Hypertrophic/complications
- Cardiomyopathy, Hypertrophic/diagnosis
- Cardiomyopathy, Hypertrophic/physiopathology
- Cardiovascular Diseases/complications
- Cardiovascular Diseases/diagnosis
- Cardiovascular Diseases/physiopathology
- Death, Sudden, Cardiac/etiology
- Death, Sudden, Cardiac/prevention & control
- Electrocardiography/methods
- Humans
- Long QT Syndrome/complications
- Long QT Syndrome/diagnosis
- Long QT Syndrome/physiopathology
- Mass Screening
- Myocarditis/complications
- Myocarditis/diagnosis
- Myocarditis/physiopathology
- Wolff-Parkinson-White Syndrome/complications
- Wolff-Parkinson-White Syndrome/diagnosis
- Wolff-Parkinson-White Syndrome/physiopathology
Collapse
Affiliation(s)
- Hung M Le
- Boston Children's Hospital, Department of Orthopedics, Division of Sports Medicine, Boston, Massachusetts.
| | - Brian C Downey
- Tufts Medical Center, Division of Cardiology, Boston, Massachusetts
| | - Corey J Lanois
- Boston Children's Hospital, Department of Orthopedics, Division of Sports Medicine, Boston, Massachusetts
| | - Patricia E Miller
- Boston Children's Hospital, Department of Orthopedics, Division of Sports Medicine, Boston, Massachusetts
| | - Cynthia J Stein
- Boston Children's Hospital, Department of Orthopedics, Division of Sports Medicine, Boston, Massachusetts
| | | | - Gianmichel D Corrado
- Boston Children's Hospital, Department of Orthopedics, Division of Sports Medicine, Boston, Massachusetts; Northeastern University, Boston, Massachusetts
| |
Collapse
|
12
|
Dong HC, Ho TH, Nguyen TM, Kawazoe Y, Le HM. Dissociation of hydrogen peroxide in water and methanol through a biased molecular dynamics investigation. J Comput Chem 2021; 42:1344-1353. [PMID: 33977539 DOI: 10.1002/jcc.26539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 02/23/2021] [Accepted: 04/04/2021] [Indexed: 11/06/2022]
Abstract
The two dissociation channels of HOOH, namely, HOOH and HOOH, in water and methanol are investigated using umbrella-sampling ab initio molecular dynamics. Our potential of mean force calculations reveals the HOOH dissociation to be more favorable in methanol with a free energy barrier of 7.56 kcal/mol, while the HOOH dissociation possesses a free energy barrier of 11.46 kcal/mol. In water, the HOOH dissociation channel is more favorable (8.25 kcal/mol), while the HOOH dissociation process requires a higher free energy (11.28 kcal/mol). Such reaction favorability can be explained by inspecting the formation of secondary radical species during the course of multiple hydrogen donating-accepting processes in each reaction channel. The radical species, that is, H3 O• (observed in water) and CH3 OH2 • (observed in methanol), are the first subordinate species upon the HOOH dissociation. For the HOOH dissociation channel in methanol, the secondary species such as water and formaldehyde can be observed, while the re-generation of HOOH in water can be spotted.
Collapse
Affiliation(s)
- Hieu C Dong
- Future Materials and Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Vietnam.,Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Vietnam
| | - Thi H Ho
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Thu M Nguyen
- Future Materials and Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Vietnam.,Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Vietnam
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, Sendai, Japan.,Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
| | - Hung M Le
- Future Materials and Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Vietnam.,Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Vietnam
| |
Collapse
|
13
|
Abstract
Umbrella-sampling density functional theory molecular dynamics (DFT-MD) has been employed to study the full catalytic cycle of the allylic oxidation of cyclohexene using a Cu(ii) 7-amino-6-((2-hydroxybenzylidene)amino)quinoxalin-2-ol complex in acetonitrile to create cyclohexenone and H2O as products. After the initial H-atom abstraction step, two different reaction pathways have been identified that are distinguished by the participation of alkyl hydroperoxide (referred to as the "open" cycle) versus the methanol side-product (referred to as the "closed" cycle) within the catalyst recovery process. Importantly, both pathways involve dehydrogenation and re-hydrogenation of the -NH2 group bound to the Cu-site - a feature that is revealed from the ensemble sampling of configurations of the reactive species that are stabilized within the explicit solvent environment of the simulation. Estimation of the energy span from the experimental turnover frequency yields an approximate value of 22.7 kcal mol-1 at 350 K. Whereas the closed cycle value is predicted to be 26.2 kcal mol-1, the open cycle value at 16.5 kcal mol-1. Both pathways are further consistent with the equilibrium between Cu(ii) and Cu(iii) that has previously been observed. In comparison to prior static DFT calculations, the ensemble of both solute and solvent configurations has helped to reveal a breadth of processes that underpin the full catalytic cycle yielding a more comprehensive understanding of the importance of radical reactions and catalysis recovery.
Collapse
Affiliation(s)
- Hung M Le
- Department of Chemistry, Washington State University, Pullman, Washington 99164, USA.
| | - Mariano Guagliardo
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79430, USA
| | - Anne E V Gorden
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79430, USA
| | - Aurora E Clark
- Department of Chemistry, Washington State University, Pullman, Washington 99164, USA. and Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| |
Collapse
|
14
|
Delbarre M, Le HM, Boucenna W, Froussart-Maille F. [Refractive surgery for hyperopia]. J Fr Ophtalmol 2021; 44:723-729. [PMID: 33836914 DOI: 10.1016/j.jfo.2020.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 11/16/2020] [Indexed: 10/21/2022]
Abstract
Hyperopia is a refractive error in which light is focused behind, instead of on, the retina. Clear vision can be obtained by accommodation, but in the long run, this results in eye strain. Hyperopia can be classified as low [≤2.00 diopters (D)], moderate (2.00-4.00 D) and high (>4.00 D). Detailed preoperative evaluation is necessary and essential to obtain good postoperative results. Various surgical techniques can be proposed to correct this ametropia. The main techniques used act either by modifying the corneal curvature with the Excimer laser or by implanting a phakic intraocular lens. The anatomical peculiarities of the hyperopic eye (small corneal diameter, short axial length, narrow anterior chamber or large kappa angle) make refractive surgery for hyperopia a considerable challenge. Large optical ablation zones now allow correction of high hyperopia by reducing the risks of optical aberrations and regression. The patient must be informed and understand the postoperative course, which differs from that of surgery for myopia.
Collapse
Affiliation(s)
- M Delbarre
- Service d'ophtalmologie, Hôpital d'instruction des Armées Percy, 101, avenue Henri-Barbusse, BP 406, 92141 Clamart cedex, France.
| | - H M Le
- Département d'ophtalmologie, Centre hospitalier intercommunal de Créteil, 40, avenue de Verdun, 94000 Créteil, France
| | - W Boucenna
- Service d'ophtalmologie, CHU Amiens-Picardie, 1, rond-point du Professeur-Christian-Cabrol, 80054 Amiens, France
| | - F Froussart-Maille
- Service d'ophtalmologie, Hôpital d'instruction des Armées Percy, 101, avenue Henri-Barbusse, BP 406, 92141 Clamart cedex, France; École du Val-de-Grâce, 1, place Alphonse-Laveran, 75230 Paris cedex 05, France
| |
Collapse
|
15
|
Abstract
ABSTRACT The availability of handheld ultrasound offers physicians an opportunity to better define anatomy and pathophysiology, thus enhancing the diagnostic capabilities of a standard physical examination. The medical community increasingly embraces the potential for point-of-care ultrasound across medical specialties. The primary aim of this review was to identify and compile information on the current clinical utility of point-of-care ultrasound for musculoskeletal examination. This information will enable health care providers to understand the current utility and potential of musculoskeletal point-of-care ultrasound, thus facilitating its appropriate adoption into clinical practice.
Collapse
Affiliation(s)
| | - Hung M Le
- Division of Sports Medicine, Department of Orthopedics, Boston Children's Hospital, Boston, MA
| | | | | |
Collapse
|
16
|
Ho TH, Dong HC, Bui VQ, Kawazoe Y, Le HM. Reaction probability and kinetics of water splitting on the penta-NiAs 2 monolayer from an ab initio molecular dynamics investigation. Phys Chem Chem Phys 2020; 22:18149-18154. [PMID: 32766624 DOI: 10.1039/d0cp02418j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction probability and kinetics of the water splitting process on the penta-NiAs2 monolayer are studied using ab initio molecular dynamics simulations. A total of 100 trajectories are investigated, in which a H2O molecule is set to strike the surface with a translational energy of 1 eV or 2 eV. The results show that the NiAs2 monolayer is an excellent candidate for the activation of water splitting with a reaction probability of 94% for both energy levels. Interestingly, the kinetics of two O-H dissociation stages varies greatly with respect to the inletting translational energy. Interpreting the reaction data for the 1 eV case, we conclude that O-H1 and O-H2 dissociations are first-order processes. However, such dissociation steps become pseudo-zeroth order in the 2 eV case. At the time of the dissociation, the force acting on atoms and the principal component analysis suggest that the two OH breaking stages behave like harmonic springs until reaching the dissociation.
Collapse
Affiliation(s)
- Thi H Ho
- Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam. and Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
| | - Hieu C Dong
- Future Materials and Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam and The Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam
| | - Viet Q Bui
- Department of Chemistry, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan and Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur 603203, Tamil Nadu, India and School of Physics, Institute of Science, Suranaree University of Technology, 111 University Avenue, Nakhon Ratchasima 30000, Thailand
| | - Hung M Le
- Institute of Research and Development, Duy Tan University, Danang 550000, Vietnam
| |
Collapse
|
17
|
Ho TH, Hoang HT, Dong HC, Kawazoe Y, Le HM. Induced Magnetism of the MoS 2 Monolayer during the Transition Metal (Fe/Ni) Bombardment Process: A Nonadiabatic Ab Initio Collision Dynamics Investigation. ACS Omega 2020; 5:16139-16148. [PMID: 32656436 PMCID: PMC7346258 DOI: 10.1021/acsomega.0c01740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 06/12/2020] [Indexed: 06/11/2023]
Abstract
The source of induced magnetism in the MoS2 monolayer induced by transition metal (Fe/Ni) collision is investigated using nonadiabatic ab inito molecular dynamics simulations that take into account high-spin and low-spin energy states during trajectory integration. By considering various metal firing angles, a strong interaction between the Fe/Ni atom and the MoS2 surface can be observed because of enormous increase in the kinetic energy of the metal atom. When firing along the Mo-S bond, the Fe bullet is pulled more strongly than when firing along the S-Mo-S bisector. Spin polarization of MoS2 is gradually induced when Fe approaches the surface and eliminated when Fe roams around a potential energy trap on the MoS2 layer. We observe that there is charge transfer between Fe and Mo atoms, which enhances the probability of electron pairing and leads to instantaneous vanishing of total magnetization. The Ni-MoS2 system is found to establish a total magnetization of 1.5-4 μB when Ni is 2.0 Å above the surface. Interestingly, the strong bonding attachment of Ni suppresses the band gap to at least 40%.
Collapse
Affiliation(s)
- Thi H. Ho
- Division
of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City 700000, Viet Nam
- Faculty
of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Viet Nam
| | - Hieu T. Hoang
- Center
for Innovative Materials and Architectures (INOMAR), Viet Nam National University-Ho Chi Minh (VNU-HCM), Ho Chi Minh City 721337, Viet Nam
| | - Hieu C. Dong
- Center
for Innovative Materials and Architectures (INOMAR), Viet Nam National University-Ho Chi Minh (VNU-HCM), Ho Chi Minh City 721337, Viet Nam
| | - Yoshiyuki Kawazoe
- New
Industry Creation Hatchery Center, Tohoku
University, Sendai 980-8579, Japan
| | - Hung M. Le
- Institute
of Research and Development, Duy Tan University, Danang 550000, Viet Nam
| |
Collapse
|
18
|
Le HM, Dubon M. Heel Pain - Skier. Med Sci Sports Exerc 2020. [DOI: 10.1249/01.mss.0000675748.05134.e8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
19
|
Le HM, Lanois CJ, Stein CJ, Miller PE, Kerkhof DL, Corrado GD. Accuracy Of The Limb-lead Electrocardiogram In Identifying Conditions Associated With Sudden Cardiac Death. Med Sci Sports Exerc 2020. [DOI: 10.1249/01.mss.0000681356.44674.48] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
20
|
Abstract
There are many causes of acute hip pain. Obturator internus (OI) muscle strain is a rare cause of the presentation. We report a case of OI muscle strain in a 15-year-old ski racer who presented with new onset acute right hip pain. Magnetic resonance imaging showed enhancement of the obturator internus muscle indicating muscle injury. Patient was treated conservatively with target physical therapy and NSAIDs for pain management. This case illustrates an atypical diagnosis for a common chief complaint.
Collapse
Affiliation(s)
- Hung M Le
- Division of Sports Medicine, Department of Orthopedic Surgery, Children's Hospital of Boston, Boston, MA, USA -
| | - Sarah S Jackson
- Division of Sports Medicine, Department of Orthopedic Surgery, Children's Hospital of Boston, Boston, MA, USA
| |
Collapse
|
21
|
Dong HC, Hoang HT, Tran DM, Phan TB, Bureekaew S, Kawazoe Y, Le HM. A proton transfer mechanism along the PO 4 anion chain in the [Zn(HPO 4)(H 2PO 4)] 2- coordination polymer. Phys Chem Chem Phys 2019; 21:18605-18611. [PMID: 31414089 DOI: 10.1039/c9cp04216d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we revisit the proton transfer mechanism in [Zn(HPO4)(H2PO4)]2-, a coordination polymer possessing high proton conductivity. In a previous report [N. Phattharasupakun, J. Wutthiprom, S. Kaenket, Th. Maihom, J. Limtrakul, M. Probst, S. S. Nagarkar, S. Horike and M. Sawangphruk, Chem. Commun., 2017, 53, 11786-11789], it was hypothesized that protons could move along the ImH+ chain involving phosphate anions within the polymer structure, with energy barriers >1.3 eV. Adopting M06-2X calculations to examine the reaction pathway, we observe that it is much more favorable for H+ to move along a one-dimensional channel formed by HPO42- and H2PO4- anions. Within a unit cell, the proton hopping process can be divided into three elementary steps. For the forward proton transfer direction, the maximum energy barrier is only 0.04 eV, while that of the backward direction is 0.27 eV. Even though the barriers of the backward direction seem to outreach the barriers of the forward direction, both are still low in comparison with those reported in the literature. Moreover, we also point out the involvement of PO4 rotation during the proton transfer process. Activation energies of 0.37 eV and 0.15 eV are required for single steps of rotation of the phosphate anion. Both H+ translation (hopping) and rotation steps of PO4 anions simultaneously participate in the course of proton transfer in the coordination polymer.
Collapse
Affiliation(s)
- Hieu C Dong
- Center for Innovative Materials and Architectures (INOMAR), Vietnam National University, Ho Chi Minh City 721337, Vietnam.
| | | | | | | | | | | | | |
Collapse
|
22
|
Le HM, Boch AL, Gerber S, Cornu P, Bodaghi B, Lehoang P, Touitou V. [Acute visual loss related to sphenoid meningioma]. J Fr Ophtalmol 2019; 42:485-491. [PMID: 30926270 DOI: 10.1016/j.jfo.2018.12.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 12/10/2018] [Accepted: 12/12/2018] [Indexed: 10/27/2022]
Abstract
Meningiomas represent about 20% of intracranial tumors. Involvement of the medial sphenoid wing includes anterior clinoid, cavernous sinus and superior orbital fissure meningiomas. Due to the proximity of these tumors to the optic nerve, typically progressive unilateral vision loss, over several months to years, is the classic clinical presentation. We report three cases of acute monocular vision loss, two transient and one permanent, ipsilateral to a sphenoid meningioma. Ophthalmological involvement with sphenoid meningiomas is most often chronic, due to interruption of axoplasmic flow and demyelination of the optic nerve by local compression. However, vascular involvement with ischemia of the optic nerve or transient low blood flow secondary to compression of the carotid branches vascularizing these structures is another possible mechanism. In our series, two patients had amaurosis fugax, and one patient had sudden, persistent visual loss in relation to acute anterior ischemic optic neuropathy on the side of the meningioma. The mean age of patients with acute visual manifestations was 62 years. These ischemic and non-compressive visual symptoms, ipsilateral to sphenoid meningiomas, are difficult to interpret. Whether these temporary visual disturbances of vascular origin should be considered an early sign of future severe or permanent visual impairment when no optic nerve compression is observed is not certain. The place of these acute visual disturbances in the therapeutic decision, particularly surgical, remains to be defined. Larger multicentric prospective studies are needed to better understand the role of local circulatory factors attributable to meningioma in the occurrence of these acute visual signs.
Collapse
Affiliation(s)
- H M Le
- Département d'ophtalmologie, DHU vision et handicaps, hôpital Pitié-Salpêtrière, 47-92, boulevard de l'Hopital, 75013 Paris, France
| | - A-L Boch
- Département de neurochirurgie, hôpital Pitié-Salpêtrière, 47-92, boulevard de l'Hopital, 75013 Paris, France
| | - S Gerber
- Département de neuroradiologie, hôpital Pitié-Salpêtrière, 47-92, boulevard de l'Hopital, 75013 Paris, France
| | - P Cornu
- Département de neurochirurgie, hôpital Pitié-Salpêtrière, 47-92, boulevard de l'Hopital, 75013 Paris, France
| | - B Bodaghi
- Département d'ophtalmologie, DHU vision et handicaps, hôpital Pitié-Salpêtrière, 47-92, boulevard de l'Hopital, 75013 Paris, France
| | - P Lehoang
- Département d'ophtalmologie, DHU vision et handicaps, hôpital Pitié-Salpêtrière, 47-92, boulevard de l'Hopital, 75013 Paris, France
| | - V Touitou
- Département d'ophtalmologie, DHU vision et handicaps, hôpital Pitié-Salpêtrière, 47-92, boulevard de l'Hopital, 75013 Paris, France.
| |
Collapse
|
23
|
Dinh VP, Huynh TDT, Le HM, Nguyen VD, Dao VA, Hung NQ, Tuyen LA, Lee S, Yi J, Nguyen TD, Tan LV. Insight into the adsorption mechanisms of methylene blue and chromium(iii) from aqueous solution onto pomelo fruit peel. RSC Adv 2019; 9:25847-25860. [PMID: 35530102 PMCID: PMC9070119 DOI: 10.1039/c9ra04296b] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 08/06/2019] [Indexed: 12/07/2022] Open
Abstract
In this study, the biosorption mechanisms of methylene blue (MB) and Cr(iii) onto pomelo peel collected from our local fruits are investigated by combining experimental analysis with ab initio simulations.
Collapse
Affiliation(s)
- Van-Phuc Dinh
- Institute of Fundamental and Applied Sciences
- Duy Tan University
- Ho Chi Minh City 700000
- Vietnam
| | | | - Hung M. Le
- Center for Innovative Materials and Architectures (INOMAR)
- Vietnam National University (VNUHCM)
- Ho Chi Minh City
- Vietnam
| | | | - Vinh-Ai Dao
- Institute of Fundamental and Applied Sciences
- Duy Tan University
- Ho Chi Minh City 700000
- Vietnam
| | - N. Quang Hung
- Institute of Fundamental and Applied Sciences
- Duy Tan University
- Ho Chi Minh City 700000
- Vietnam
| | - L. Anh Tuyen
- Center for Nuclear Techniques
- Vietnam Atomic Energy Institute
- Ho Chi Minh City, 700000
- Vietnam
| | - Sunhwa Lee
- School of Information and Communication Engineering
- Sungkyunkwan University
- Suwon 16419
- Korea
| | - Junsin Yi
- School of Information and Communication Engineering
- Sungkyunkwan University
- Suwon 16419
- Korea
| | - Trinh Duy Nguyen
- Center of Excellence for Green Energy and Environmental Nanomaterials (CE@GrEEN)
- Nguyen Tat Thanh University
- Ho Chi Minh City
- Vietnam
| | - L. V. Tan
- Industrial University of Ho Chi Minh City
- HCM City
- Vietnam
| |
Collapse
|
24
|
Ho TH, Kawazoe Y, Le HM. Penetrating probability and cross section of the Li +-C 60 encapsulation process through an ab initio molecular dynamics investigation. Phys Chem Chem Phys 2018; 20:7007-7013. [PMID: 29468229 DOI: 10.1039/c7cp08174j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The endohedral complex system of Li+-C60 has been shown to possess interesting applications in photovoltaics, supramolecular chemistry, and functionalized materials. In this study, we perform a theoretical investigation of Li+ encapsulation within a C60 cage by employing an ab initio molecular dynamics approach. The Li+ cation is positioned 9 Å away from the C60 center of mass, and fired towards a randomized spot in a six-membered ring with a certain level of inletting energy, which is 7.5 eV, 9 eV, 12 eV, or 15 eV. In total, 2000 samples of MD trajectories are investigated. Our statistical results yielded a penetrating probability in the range of 0.8% to 15.6% with respect to the above inletting energy, while the cross section ranges from 0.006 Å2 to 0.123 Å2. Moreover, we observed that the penetrating probability exhibited direct proportionality to the inletting energy. Hence, we can determine that the minimum required inletting energy for reaction occurrence is 6.6 eV. Overall, it seems difficult for Li+ to penetrate through the sp2-carbon wall, because a very high inletting energy is required to open the entrance. At the same time, Li+ must approach closely to the center of a six-membered ring to enhance the penetration probability.
Collapse
Affiliation(s)
- Thi H Ho
- Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
| | | | | |
Collapse
|
25
|
Ho TH, Kawazoe Y, Le HM. Correction: Penetrating probability and cross section of the Li +–C 60 encapsulation process through an ab initio molecular dynamics investigation. Phys Chem Chem Phys 2018; 20:26786. [DOI: 10.1039/c8cp91882a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for ‘Penetrating probability and cross section of the Li+–C60 encapsulation process through an ab initio molecular dynamics investigation’ by Thi H. Ho et al., Phys. Chem. Chem. Phys., 2018, 20, 7007–7013.
Collapse
Affiliation(s)
- Thi H. Ho
- Division of Computational Physics
- Institute for Computational Science
- Ton Duc Thang University
- Ho Chi Minh City
- Vietnam
| | | | - Hung M. Le
- Division of Molecular Modeling
- Center for Innovative Materials and Architectures
- Vietnam National University
- Ho Chi Minh City
- Vietnam
| |
Collapse
|
26
|
Ho TH, Bui VQ, Bach Phan T, Kawazoe Y, Le HM. Atomistic observation of the collision and migration of Li on MoSe 2 and WS 2 surfaces through ab initio molecular dynamics. Phys Chem Chem Phys 2017; 19:27332-27342. [PMID: 28971193 DOI: 10.1039/c7cp05847k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present in this study a theoretical investigation of the collision of Li with the MX2 surface (MoSe2 or WS2) by employing the Born-Oppenheimer molecular dynamics (MD) approach. In each trajectory, atomic Li is fired toward the two-dimensional monolayer with an inletting kinetic energy of 0.2 eV or 2.0 eV and a chosen striking angle. In total, 84 MD trajectories are analyzed. We observe that Li has a high tendency to migrate on WS2 in most investigated cases (20/21 cases at 0.2 eV inletting kinetic energy and 21/21 cases at 2.0 eV inletting kinetic energy), while the migration probability on MoSe2 is much lower (only 5/21 cases with the inletting kinetic energy of 0.2 eV and 15/21 cases with the inletting kinetic energy of 2.0 eV). Interestingly, our finding shows that the migration probability does not depend on the binding energies of Li-MoSe2 (1.61 eV) and Li-WS2 (1.77 eV), but it is in good agreement with the nudged-elastic-band prediction of migration barriers. In fact, it is the intensity of elastic vibration of the transition metal dichalcogenide layer that plays a very significant role in the migration of Li. During the collision process, Li is able to absorb energy from the layer vibration to jump out from one X-X-X trap to another. Consequently, with the assistance from intensive vibration of WS2, Li would possess higher migration probability on the layer surface. Finally, electronic structure analysis on various interacting Li-MX2 configurations is performed. From Bader charge estimation, we observe that WS2 tends to establish more charge transferability with Li. Moreover, when Li approaches closer to the S/Se layer, the hybridization of Li-2s and Mo-4d (or W-5d) orbitals results in a magnetic moment (up to ∼1 μB).
Collapse
Affiliation(s)
- Thi H Ho
- Division of Molecular Modeling, Center for Innovative Materials and Architectures, Vietnam National University, Ho Chi Minh City, Vietnam
| | | | | | | | | |
Collapse
|
27
|
Affiliation(s)
- Hung M. Le
- VA Texas Valley Coastal Bend Health Care System, Harlingen, TX
| | | |
Collapse
|
28
|
Pham NNT, Le HM. A Density Functional Theory Investigation of Ni
n
, Pd
n
, and Pt
n
Clusters (n
=1-4) Adsorbed on Buckminsterfullerene. Chemphyschem 2017; 18:1376-1384. [DOI: 10.1002/cphc.201601374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 02/13/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Nguyet N. T. Pham
- Faculty of Materials Science; University of Science, Vietnam National University; Ho Chi Minh City Vietnam
| | - Hung M. Le
- Computational Chemistry Research Group; Ton Duc Thang University; Ho Chi Minh City Vietnam
- Faculty of Applied Sciences; Ton Duc Thang University; Ho Chi Minh City Vietnam
| |
Collapse
|
29
|
Bui VQ, Le HM, Kawazoe Y, Kim Y. Adjusting band gap and charge transfer of organometallic complex adsorbed on MoS 2 monolayer using vertical electric-field: a first-principles investigation. J Phys Condens Matter 2017; 29:015003. [PMID: 27830656 DOI: 10.1088/0953-8984/29/1/015003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this paper, we propose the use of benzene (Bz) to cover the active site on top of a transition metal atom (Cr/Mn/Fe) adsorbed on the MoS2 monolayer. Stable configurations of adatom on the MoS2 surface were predicted using first-principles calculations and their electronic, magnetic properties were investigated. In addition, the influence of vertical electric field on the electronic band structures of the systems was carefully examined. Analyzing the adsorption energies of transition metals given by the PBE calculations, we found that the benzene molecule stabilized the binding of Cr and Mn on the MoS2 surface, but destabilized the Fe binding by approximately 33% of adsorption energy. The attachment of benzene caused modifications on the total magnetizations of the Cr-MoS2 and Mn-MoS2 structures. The Bz-Mn@MoS2 structure was found to exhibit half-metallicity with 100% spin polarization at the Fermi level. The influence of various degrees of vertical electric field was shown to produce a tensile stress, which altered the lattice parameters and led to band gap narrowing and dramatic shifts of the Fermi level.
Collapse
Affiliation(s)
- Viet Q Bui
- Department of Applied Chemistry & Institute of Natural Sciences, Kyung Hee University, Yongin-si, Gyonggi-do 17104, Korea
| | | | | | | |
Collapse
|
30
|
Le HM, Bui VQ, Hoang Tran P, Pham-Tran NN, Kawazoe Y, Nguyen-Manh D. The prospect of sensitizing organic dyes attached to the MoS2 surface: Physical insights from density functional theory investigations. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.11.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
31
|
Le HM, Pham TT, Dinh TS, Kawazoe Y, Nguyen-Manh D. First-principles modeling of 3d-transition-metal-atom adsorption on silicene: a linear-response DFT + U approach. J Phys Condens Matter 2016; 28:135301. [PMID: 26940978 DOI: 10.1088/0953-8984/28/13/135301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
By employing DFT + U calculations with the linear response method, we investigate the interactions between various 3d transition-metal atoms (Cr, Mn, Fe, Co) and silicene. In the cases of two-dimensional (2D) FeSi2 and CoSi2, the metal atoms tend to penetrate into the silicene layer. While CoSi2 is non-magnetic, FeSi2 exhibits a total magnetic moment of 2.21 μ(B)/cell. Upon the examination of 2D MSi6, a trend in anti-ferromagnetic (AFM) favorability in the z-direction is observed according to our DFT + U calculations. In the ferromagnetic (FM) states (less stable), each primary unit cell of CrSi6, MnSi6, and FeSi6 possesses different levels of total magnetization (4.01, 5.18, and 2.00 μ B/cell, respectively). The absolute magnetization given by AFM MSi6 structures varies in the range of 5.33-5.84 μ(B)/cell. A direct band gap in AFM MnSi6 (0.2 eV) is predicted, while the metastable FM FeSi6 structure has a wider band gap (0.85 eV). Interestingly, there are superexchange interactions between metal atoms in the MSi6 systems, which result in the AFM alignments.
Collapse
Affiliation(s)
- Hung M Le
- Department of Materials Science, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
| | | | | | | | | |
Collapse
|
32
|
Le HM, Validire P, Mayeur D, Seguin-Givelet A, Gossot D. [Intrapulmonary bronchogenic cysts]. Rev Mal Respir 2016; 33:622-5. [PMID: 26795080 DOI: 10.1016/j.rmr.2015.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 11/06/2015] [Indexed: 10/22/2022]
Abstract
INTRODUCTION Bronchogenic cysts are congenital malformations that are usually located in the mediastinum. Intrapulmonary location is rare. OBSERVATION Four cases of intrapulmonary bronchogenic cysts are reported in order to discuss their clinical and radiological presentation and their treatment. CONCLUSION Intrapulmonary bronchogenic cysts diagnostic is often missed. This condition must however be known so as to foresee a resection in order to prevent a potential complication.
Collapse
Affiliation(s)
- H M Le
- Département thoracique, institut mutualiste Montsouris, 42, boulevard Jourdan, 75014 Paris, France
| | - P Validire
- Département d'anatomo-pathologie, institut mutualiste Montsouris, 75014 Paris, France
| | - D Mayeur
- Département thoracique, institut mutualiste Montsouris, 42, boulevard Jourdan, 75014 Paris, France
| | - A Seguin-Givelet
- Département thoracique, institut mutualiste Montsouris, 42, boulevard Jourdan, 75014 Paris, France; Université Sorbonne Paris Cité, UFR SMBH université Paris 13, Paris, France
| | - D Gossot
- Département thoracique, institut mutualiste Montsouris, 42, boulevard Jourdan, 75014 Paris, France.
| |
Collapse
|
33
|
Ho TH, Pham-Tran NN, Kawazoe Y, Le HM. Ab Initio Investigation of O-H Dissociation from the Al-OH2 Complex Using Molecular Dynamics and Neural Network Fitting. J Phys Chem A 2016; 120:346-55. [PMID: 26741404 DOI: 10.1021/acs.jpca.5b09497] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dissociation dynamics of the O-H bond in Al-OH2 is investigated on an approximated ab initio potential energy surface (PES). By adopting a dynamic sampling method, we obtain a database of 92 834 configurations. The potential energy for each point is calculated using MP2/6-311G (3df, 2p) calculations; then, a 60-neuron feed-forward neural network is utilized to fit the data to construct an analytic PES. The root-mean-square error (rmse) for the training set is reported as 0.0036 eV, while the rmse for the independent testing set is 0.0034 eV. Such excellent fitting accuracy indeed confirms the reliability of the constructed PES. Subsequently, quasi-classical molecular dynamics (MD) trajectories are performed on the constructed PES at various levels of vibrational excitation in the range of 1.03 to 2.23 eV to investigate the probability of O-H bond dissociation. The results indicate a linear relationship between reaction probability and internal energy, from which we can determine the minimum activation internal energy required for the dissociation as 0.62 eV. Moreover, the O-H bond rupture is shown to be highly correlated with the formation of Al-O bond.
Collapse
Affiliation(s)
- Thi H Ho
- Department of Materials Science, University of Science, Vietnam National University , Ho Chi Minh City, Vietnam
| | - Nguyen-Nguyen Pham-Tran
- Department of Chemistry, University of Science, Vietnam National University , Ho Chi Minh City, Vietnam
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University , Sendai City, Japan.,Thermophysics Institute, Siberian Branch, Russian Academy of Sciences , Novosibirsk, Russia
| | - Hung M Le
- Computational Chemistry Research Group, Ton Duc Thang University , Ho Chi Minh City, Vietnam.,Faculty of Applied Sciences, Ton Duc Thang University , Ho Chi Minh City, Vietnam
| |
Collapse
|
34
|
Bui VQ, Pham TT, Le DA, Thi CM, Le HM. A first-principles investigation of various gas (CO, H2O, NO, and O2) absorptions on a WS2 monolayer: stability and electronic properties. J Phys Condens Matter 2015; 27:305005. [PMID: 26173094 DOI: 10.1088/0953-8984/27/30/305005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Using first-principles calculations, we investigate the interactions between a WS2 monolayer and several gas molecules (CO, H2O, NO, and O2). Different sets of calculations are performed based on generalized-gradient approximations (GGAs) and GGA + U ([Formula: see text] eV) calculations with D2 dispersion corrections. In general, GGA and GGA + U establish good consistency with each other in terms of absorption stability and band gap estimations. Van der Waals density functional (vdW-DF) calculations are also performed to validate long-range gas molecule-WS2 monolayer interactions, and the resultant absorption energies of four gas-absorption cases (from 0.21 to 0.25 eV) are significantly larger than those obtained from calculations using empirical D2 corrections (from 0.11 to 0.19 eV). The reported absorption energies clearly indicate van der Waals interactions between the WS2 monolayer and gas molecules. The NO and O2 absorptions are shown to narrow the band gaps of the WS2 material to 0.75-0.95 eV and produce small magnetic moments (0.71 μB and 1.62 μB, respectively). Moreover, these two gas molecules also possess good charge transferability to WS2. This observation is important for NO- and O2-sensing applications on the WS2 surface. Interestingly, WS2 can also activate the dissociation of O2 with an estimated barrier of 2.23 eV.
Collapse
Affiliation(s)
- Viet Q Bui
- Department of Materials Science, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
| | | | | | | | | |
Collapse
|
35
|
Le HM, Ng WK, Hirao H. Electronic and magnetic properties of C60–Fen–graphene intercalating nanostructures (n=1–6) predicted from first-principles calculations. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.10.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
36
|
Le HM, Petrovic D, Verbanck MA. The semi-sewer river: hydraulic backwater effects and combined sewer overflow reverse flows in Central Brussels reduce deoxygenation impact further downstream. Water Sci Technol 2014; 69:903-908. [PMID: 24569294 DOI: 10.2166/wst.2013.800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In 2011 and 2012 the dissolved oxygen content in the low-discharge river Zenne was monitored continuously, every 5 minutes, downstream of Brussels city centre, making it possible to document the complex mechanisms by which combined sewer overflow (CSO) spills affect both the hydraulics and the oxygen balance of the hydrosystem. In addition to oxygen demand impacts, proportions of water volumes are such that the oxygen-devoid sewage water discharged from CSOs contributes significantly to the oxygen deficit observed in the river further downstream. It is shown that ensuing unexpected hydraulic behaviour, such as a full river-flow reversal, can explain the dual nature of oxygen sag following major CSO events. At times the semi-sewer river plays the role of an in-stream stormwater tank, effectively attenuating the environmental impacts of Brussels CSOs.
Collapse
Affiliation(s)
- H M Le
- Department of Water Pollution Control, Universite libre de Bruxelles (ULB), Boulevard du Triomphe CP 208, 1050 Brussels, Belgium E-mail:
| | - D Petrovic
- Department of Water Pollution Control, Universite libre de Bruxelles (ULB), Boulevard du Triomphe CP 208, 1050 Brussels, Belgium E-mail:
| | - M A Verbanck
- Department of Water Pollution Control, Universite libre de Bruxelles (ULB), Boulevard du Triomphe CP 208, 1050 Brussels, Belgium E-mail:
| |
Collapse
|
37
|
Nguyen-Truong HT, Thi CM, Le HM. Theoretical investigations of BBS (singlet)→BSB (triplet) transformation on a potential energy surface obtained from neural network fitting. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.09.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
38
|
Le HM, Hirao H, Kawazoe Y, Nguyen-Manh D. First-principles modeling of C60–Cr–graphene nanostructures for supporting metal clusters. Phys Chem Chem Phys 2013; 15:19395-404. [DOI: 10.1039/c3cp53529k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
39
|
Vu NH, Le HV, Cao TM, Pham VV, Le HM, Nguyen-Manh D. Anatase-rutile phase transformation of titanium dioxide bulk material: a DFT + U approach. J Phys Condens Matter 2012; 24:405501. [PMID: 22951569 DOI: 10.1088/0953-8984/24/40/405501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The anatase-rutile phase transformation of TiO(2) bulk material is investigated using a density functional theory (DFT) approach in this study. According to the calculations employing the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional with the Vanderbilt ultrasoft pseudopotential, it is suggested that the anatase phase is more energetically stable than rutile, which is in variance with the experimental observations. Consequently, the DFT + U method is employed in order to predict the correct structural stability in titania from electronic-structure-based total energy calculations. The Hubbard U term is determined by examining the band structure of rutile with various values of U from 3 to 10 eV. At U = 5 eV, a theoretical bandgap for rutile is obtained as 3.12 eV, which is in very good agreement with the reported experimental bandgap. Hence, we choose the DFT + U method (with U = 5 eV) to investigate the transformation pathway using the newly-developed solid-state nudged elastic band (ss-NEB) method, and consequently obtain an intermediate transition structure that is 9.794 eV per four-TiO(2) above the anatase phase. When the Ti-O bonds in the transition state are examined using charge density analysis, seven Ti-O bonds (out of 24 bonds in the anatase unit cell) are broken, and this result is in excellent agreement with a previous experimental study (Penn and Banfield 1999 Am. Miner. 84 871-6).
Collapse
Affiliation(s)
- Nam H Vu
- Faculty of Materials Science, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
| | | | | | | | | | | |
Collapse
|
40
|
Nguyen HTT, Le HM. Modified Feed-Forward Neural Network Structures and Combined-Function-Derivative Approximations Incorporating Exchange Symmetry for Potential Energy Surface Fitting. J Phys Chem A 2012; 116:4629-38. [DOI: 10.1021/jp3020386] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hieu T. T. Nguyen
- Faculty of Materials Science, College
of Science, Vietnam National University, Ho Chi Minh City, Vietnam
| | - Hung M. Le
- Faculty of Materials Science, College
of Science, Vietnam National University, Ho Chi Minh City, Vietnam
| |
Collapse
|
41
|
Le ATH, Vu NH, Dinh TS, Cao TM, Le HM. Molecular dynamics investigations of chlorine peroxide dissociation on a neural network ab initio potential energy surface. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1158-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
42
|
Le HM, Dinh TS, Le HV. Molecular Dynamics Investigations of Ozone on an Ab Initio Potential Energy Surface with the Utilization of Pattern-Recognition Neural Network for Accurate Determination of Product Formation. J Phys Chem A 2011; 115:10862-70. [DOI: 10.1021/jp206531s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hung M. Le
- Faculty of Materials Science, College of Science, Vietnam National University, Ho Chi Minh City, Vietnam 750000
| | - Thach S. Dinh
- Faculty of Materials Science, College of Science, Vietnam National University, Ho Chi Minh City, Vietnam 750000
| | - Hieu V. Le
- Faculty of Materials Science, College of Science, Vietnam National University, Ho Chi Minh City, Vietnam 750000
| |
Collapse
|
43
|
Le HM, Raff LM. Molecular Dynamics Investigation of the Bimolecular Reaction BeH + H2 → BeH2 + H on an ab Initio Potential-Energy Surface Obtained Using Neural Network Methods with Both Potential and Gradient Accuracy Determination. J Phys Chem A 2009; 114:45-53. [DOI: 10.1021/jp907507z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hung M. Le
- Chemistry Department, Oklahoma State University, Stillwater, Oklahoma 74078
| | - Lionel M. Raff
- Chemistry Department, Oklahoma State University, Stillwater, Oklahoma 74078
| |
Collapse
|
44
|
Le HM, Huynh S, Raff LM. Molecular dissociation of hydrogen peroxide (HOOH) on a neural network ab initio potential surface with a new configuration sampling method involving gradient fitting. J Chem Phys 2009; 131:014107. [DOI: 10.1063/1.3159748] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
45
|
Le HM, Raff LM. Cis→trans, trans→cis isomerizations and N–O bond dissociation of nitrous acid (HONO) on an ab initio potential surface obtained by novelty sampling and feed-forward neural network fitting. J Chem Phys 2008; 128:194310. [DOI: 10.1063/1.2918503] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
46
|
Abstract
We discuss the ability of a number of standard and non-standard computational
techniques to reproduce dispersion forces, using examples from the literature
as well as some new examples. We conclude that there are still some cases
where standard methods are not so far successful. There are some promising
directions under study, however.
Manuscript received: 15 March 2001
Final version: 26 October 2001.
Collapse
|
47
|
Tikkanen MK, Carter DJ, Harris AM, Le HM, Azorsa DO, Meltzer PS, Murdoch FE. Endogenously expressed estrogen receptor and coactivator AIB1 interact in MCF-7 human breast cancer cells. Proc Natl Acad Sci U S A 2000; 97:12536-40. [PMID: 11050174 PMCID: PMC18799 DOI: 10.1073/pnas.220427297] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Coactivators are believed to mediate estrogen-induced gene responses via interaction with estrogen receptors (ER). Currently, a major challenge is to determine the importance of each coactivator in a specific cell type and promoter context in response to a particular ligand. The potential of ER to interact with a growing list of coactivators has been shown in a variety of in vitro and gene transfer assays, yet very few data have demonstrated the interaction of endogenous coactivators with ER in intact cells. We report here a ligand-specific interaction of endogenous human ER (hER) and the AIB1 coactivator in MCF-7 human breast cancer cells by using immunoprecipitation analyses. Complexes between endogenously expressed hER and AIB1 were detected in estradiol-treated cells and to a much lesser extent in cells treated with the partial agonist, monohydroxytamoxifen. We were unable to detect an hER-SRC-1 complex in our immunoprecipitations from MCF-7 cells. The in vitro-binding affinity for mouse ER interaction with AIB1 was estimated to be 40-120 nM. We conclude that AIB1 is a major coactivator for hER in MCF-7 human breast cancer cells.
Collapse
|
48
|
Abstract
We discuss two possible lines of experimental investigation based on parabolic
quantum wells. In the first proposal, we note that the Generalised Kohn
Theorem/Harmonic Potential Theorem forbids electron–electron damping
of the Kohn mode in an electron layer gas under strictly parabolic
confinement. This applies even for very strong driving. It is therefore
interesting to attempt reduction of other sources of broadening in GaAlAs
parabolic wells, so as to achieve a prominent narrow resonance in the far
infrared. We concentrate here on phononic bandgap structures, which may be of
interest for reduction of phonon effects in other systems as well. The second
class of proposed experiment involves twinned parabolic wells in an attempt to
observe van der Waals forces directly in GaAlAs systems. In a first
approximation, the parabolic or Hooke's-law nature of the confinement
allows one to use the well as a kind of spring balance to measure the weak van
der Waals force. The influence of an applied magnetic field on these forces
appears to be significant, and this system might provide the first measurement
of such an effect.
Collapse
|
49
|
Le HM, Hegedüs G, Szëkács A. Differential detection of N-heterocyclic compounds and their N-methylated derivatives by immunoanalysis. Acta Biol Hung 1999; 49:455-62. [PMID: 10526992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Competitive enzyme-linked immunosorbent assay (ELISA) systems are proposed for the indirect monitoring of formaldehyde by the parallel detection of its N-methylated precursors and the corresponding demethylated compounds. As an example for such immunoanalytical differentiation between an N-heterocyclic compound and its N-methylated derivative, the quantitative detection of the systemic triazole fungicide, myclobutanil, is discussed. Antibodies recognizing the non-zwitterionic structure of 2-(4-chlorophenyl)-2-[(1,2,4-triazol-1-yl)-methyl]-hexanonitril e (myclobutanil) showed only minor binding to corresponding N-alkylated derivatives of myclobutanil. And vice versa, literature data indicate that antibodies raised against the pyridilium ionic structure of the herbicide paraquat, displayed only mediocre reactivity towards the corresponding dealkylated derivatives. Thus, both experimental and literature data suggest that immunoanalytical methods for differential detection of N-methylated heterocycles (potentially including formaldehyde precursors) and their non-methylated counterparts are possible to develop.
Collapse
Affiliation(s)
- H M Le
- Plant Protection Institute of the Hungarian Academy of Sciences, Budapest
| | | | | |
Collapse
|
50
|
Affiliation(s)
- P Lecchi
- Laboratory of Analytical Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0805, USA
| | | | | |
Collapse
|